Improvement in eotaey steam-engines



S."-S.'1TAMIS'0N, Jr. ROTARY STBAMENGINR No. 76,770.

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Letters Patent No. 76,770, dated April 14, 1868.

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TO ALL WHOM IT MAY CONCERN:

Be it known that ll, SAMUEL S. Jamison, Jr., of Saltsburg, in the countyof Indiana, and 'Stateof Penn- I I sylvania, have invented 'a new and usefulImp'rovement in Rotary Engines; and I do hereby declare the following to be a full, clear, and exact description thereof, s'ufiicient to enable others skilled in the art to which the invention appertains to fully understand and use the same, reference beinghad to the accompanying drawings, forming a part of this specification, and in which.- I l Figure 1 is a perspective view. Figure 2 is a vertical section. a p v This invention relates to that class of rotary engines in which thestenm is applied to a revoliing cylinder, one side of which works against an abutment, arid consists insuch a construction of the cylinder and the-abutment that the engine is greatly simplified, and the cost of it reduced, while the power .of the steam is utilized to great advantage, and the parts of the engine can be readily adjusted and madesteam-tight, should they at any time work loose.

In the druwings,'A is the revolving cylinder, carrying a shaft, B, supported by a frame or bed, 0. Dis the abutment, against'which the cyIinder works, provided with a steam-induction pipe, 2', educ'tion-pipe e, and

exhaust-steam chamber E. The abutment D can be adjusted against the .cylinder A, with any requisite degree offorce, by means of. a set-screw, Roper-eating against a brace, G, the whole abutment sliding to'and from the cylinder upon guides or ways M M,"h'y which it is held firmly down to the bed, and prevented from any lateral action or vibration.

In the perimeter of the cylinder, chambers a a are formed, having expanded entrances a a, and being formed and arranged in the manner clearly shown in fig. 2, The steam from the induction-pipe 2' acts upon the walls of the chambers a a, a a, forcing the cylinder round on its'axis till the mouths of the chambers come over the exhaust-chamber E, when the steam in the chambers a a exhausts into the chamber-E, and thence to I the open air, through this pipe e. As one chamber, a a, passes out from under the influence of the inductionsteam, the revolution of the cylinder brihgs another chamber into the position'just vacated by the last one, and

subjects it, in its turn, to. the action of the live'steam, thus keeping up a constant and uniform rotary'motion of the cylinder.

By constructing and adjusting the cylinder and abutment in the manner described, with the perimeter of' the cylinder'perfectly flat, the latter will wear its own bearing true, so as to form and keep the joint between it and the abutment steam-tight.

In order to steady and strengthen the apparatus, and prevent any vibration or lateral actionof the cylinder, its perimeter may sink into or run in a groove in the concave wall of the abutment, so that it will be held perfectly steady by a flange, d, on 'each side.

The brace G may have a slight spriug,'it thought advisable, by which means the abutment will yield slightly,

. 'to accommodate itself to the expansion of the mctul by heat, 7

The form of the chambers a a is believed to possess a great advantage, in the fact that the upward pressure of the steam against the wall at is nearly or quite counterbalanced by itsdownward pressure against the well 12, leaving the working force of the steam to be applied to the wall r, in such a way as to actuate the cylinderto the greatest advantage.

The walls being perfectly straight, all the steam exhausts 'from the chambers. There is no back pressure of steam, except against the wall 01:. If the wall ran in a straight line from the point a to the point a', there would be a back pressure all along-the wall, which is now avoided bythe form of the chambers.

Having thus described my invention, what I claim as new, and desire to secure'byLetters Patent, is

The arrangement of the regulating-screw F, sprin'g-br'ace G, movable abutment D, and guides M M, 0peratingin connection with a rotary cylinder, A, in the manner described.

' v S. S. JAMISON, Ja. Witnesses:

SOLON C. Knuon, (litmu A Pnr'rrr. 

